from his appearance, he must be from the north.A. Judging B. Judge C. Judged D. To judge

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(答案→)A. Judging
B. Judge
C. Judged
D. To judge
解析：主要测试动词短语。 judging from/ by作为介词短语, 习惯上不与句子的主语保持一致 ( 即 “主动语态表被动含义”), 故不说judged from/ by .类似的例子还有:　She is very young,      her age. A. concerning B. thinking C. regarding D. Considering此题的答案为D。